SC312XDP512F0MPVR datasheet(707/1348 Pages) FREESCALE

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Chapter 19 S12X Debug (S12XDBGV2) Module

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

709

19.3.1.11.1

Debug Comparator Control Register (DBGXCTL)

The contents of this register bits 7 and 6 differ depending upon which comparator registers are visible in

the 8-byte window of the DBG module register address map

Read: Anytime

Write: Anytime when DBG not armed.

0x0029

ADDRESS HIGH

Read/Write

0x002A

ADDRESS MEDIUM

Read/Write

0x002B

ADDRESS LOW

Read/Write

0x002C

DATA HIGH COMPARATOR

Read/Write

Comparator A and C only

0x002D

DATA LOW COMPARATOR

Read/Write

Comparator A and C only

0x002E

DATA HIGH MASK

Read/Write

Comparator A and C only

0x002F

DATA LOW MASK

Read/Write

Comparator A and C only

0x0028

76543210

NDB

TAG

BRK

RWE

SRC

COMPE

Reset

00000000

Unimplemented or Reserved

Figure 19-13. Debug Comparator Control Register (Comparators A and C)

0x0028

76543210

SZE

TAG

BRK

RWE

SRC

COMPE

Reset

00000000

Figure 19-14. Debug Comparator Control Register (Comparators B and D)

Table 19-27. DBGXCTL Field Descriptions

Field

Description

(COMPB/D)

SZE

Size Comparator Enable Bit — The SZE bit controls whether access size comparison is enabled for the

associated comparator. This bit is ignored if the TAG bit in the same register is set.

0 Word/Byte access size is not used in comparison

1 Word/Byte access size is used in comparison

(COMPA/C)

NDB

Not Data Bus Compare — The NDB bit controls whether the match occurs when the data bus matches the

comparator register value or when the data bus differs from the register value. Furthermore database bits can

be individually masked using the comparator data mask registers. This bit is only available for comparators A

and C. This bit is ignored if the TAG bit in the same register is set. This bit position has an SZ functionality for

comparators B and D.

0 Match on data bus equivalence to comparator register contents

1 Match on data bus difference to comparator register contents

Table 19-26. Comparator Register Layout

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